One of the cornerstones of Google’s reputation for innovation – its 20% Time scheme – is now effectively gone, according to a report by Quartz, citing anonymous Google employees.

Google’s 20% Time allowed engineers to spend the equivalent of one day a week working on a personal project without having to justify it to anyone. Gmail, Google maps, Adsense, Google Talk and many other products were born from this scheme. Adsense alone is responsible for around 25 percent of Google’s annual revenue.